Sum of Days: Life Tracker

Sum of Days: Life Tracker

Log Numbers. See Your History.

15 ratings
23 reviews
Free
In-App Purchases

Details

Released
December 21, 2021
Updated
October 29, 2026

Features

Sum of Days: Life Tracker screenshot #1 for iPhone
Sum of Days: Life Tracker screenshot #2 for iPhone
Sum of Days: Life Tracker screenshot #3 for iPhone
Sum of Days: Life Tracker screenshot #4 for iPhone
Sum of Days: Life Tracker screenshot #5 for iPhone
iphone
iphoneDuo
ipad
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About

Log numbers, habits, and notes to track your progress over time. Visualize your history with charts and timelines, and integrate with Apple Health for a holistic view of your well-being. Gain insights into your patterns and make informed decisions about your health and routines.

✓Customizable trackers
✓Number, habit, and note logging
✓Widgets and quick-entry buttons
✓Apple Watch integration
✓Health data synchronization
✓Historical charts and timelines
✓Insightful review features
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+2

What's New in Sum of Days

2.7.2

October 29, 2026

• Support for iPhone Duo • Stability Improvements Previously.. Ask questions about your days with Ask AI. Ask AI uses verified facts from your records to answer questions about item values, dates, averages, totals, recording frequency, meaningful changes, standout days, and items that moved together. Each response leads with the answer and links back to supporting days. Your records stay on device. On supported devices, Apple's on-device model explains those verified facts; otherwise, Ask AI presents the matching facts directly. Also new: • Filter Month, Timeline, and Year by one or more items; your selection carries across all three views • Today and Item widgets support OS 27's new extra-large portrait size, and calendar widgets use their space more effectively • Richer App Intents on OS 27 help compatible system experiences understand and open items, days, Review, and Monthly Rewind; Shortcuts can also complete habits, compare items using Review's evidence rules, explain findings, and check Today Status • Command-1 through Command-7 opens Today, Month, Timeline, Year, Ask AI, Monthly Rewind, and Review on Mac and iPad

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Subscriptions & In-App Purchases

Sum of Days+ Monthly.

Monthly Subscription of Sum of Days+ Membership.

$3.991 Month
How to cancel Sum of Days subscription ⁉️

Events

Read more about Ask AI & Review your Days

Ask AI & Review your Days

Ask AI about your days and explore what changed.

Sep 11, 2026 — Oct 12, 2026

Read more about Monthly Rewind

Monthly Rewind

Check meaningful changes on last 30 days easily

Aug 27, 2026 — Sep 27, 2026

Read more about New Calendar View

New Calendar View

Month and vertical day view added!

Jul 5, 2026 — Aug 5, 2026

User reviews

excellent

simple and intuitive design. syncs well between devices. let's you export your data. reporting is good. it has become a productivity app i use everyday.

Best App to track custom data

I wonder why this app has so few ratings. The freedom to configure every data input type is exactly what I was looking for. Great visualizations also.

Does three things better

There’s a pantload of habit trackers out there. Most of them are pretty mediocre, a few are surprisingly good. JT is lacking in some of the bells and whistles but it does at least three things better than most of the others I’ve tried, and those three things are important to me. First, native iPad support. No wasted real estate. Second, solid sync. Ever have to wait hours for the iPhone to sync with the watch? Yeah, me neither. Third: BIG clear watch display. I need to track the time I take certain meds. Waking up in the wee hours to do so is no fun, and having to fiddle with a phone or iPad makes it worse. JT is the ONLY one I found with a simple, clear display - tap, tap and back to sleep. Free? No, it’s not free. You don’t work for free, why do you expect devs to do it? OTOH, $10/year is much less than many of the competition so what are you waiting for? Give it a try. 3 habits for free.
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Not a free app

And you won’t figure that out until you’ve invested set up time. This app is entirely useless as a free app. It has a good concept and I was getting excited to try it out but then I discovered it only lets you track 3 data points without upgrading to “pro”. Don’t waste your time unless you’re willing to pony up right out of the gate.
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Excellent data logger

One of the best!

Developer apps

FAQ

What is Sum of Days used for?

Sum of Days is a health and fitness app designed for logging numbers, habits, and notes. It helps users track their progress over time, visualize their history with charts and timelines, and integrate with Apple Health data.

How much does Sum of Days cost?

Sum of Days offers a free version that allows up to 3 trackers. Additional features like unlimited items, custom icons, and app locking are available through Sum of Days+ subscriptions, with monthly, yearly, and lifetime options.

Does Sum of Days have ads?

No, Sum of Days does not contain advertisements. The app is free to use with basic features and offers premium features through an optional subscription.

What devices does Sum of Days support?

Sum of Days is available on iPhone, iPad, Mac, and Apple Watch. Your tracked records can sync across your Apple devices via private iCloud storage when enabled.

Can I sync Sum of Days with Apple Health?

Yes, Sum of Days can connect to supported Apple Health data, including steps, weight, sleep, and exercise time. You can choose which Health categories to allow for viewing alongside your manually logged entries.

How often is Sum of Days updated?

The latest version of Sum of Days is 2.7.2, last updated on October 29, 2026. This indicates a history of regular updates to improve functionality and reliability.

What are the subscription options for Sum of Days+?

Sum of Days+ offers monthly ($3.99/month), 6-month ($17.99), and annual ($24.99/year) subscription plans. The annual plan includes a 7-day free trial.

Is Sum of Days suitable for children?

Sum of Days has an age rating of 4+, making it suitable for a wide range of users. The app focuses on personal tracking and health data, which are generally appropriate for this age group.